Malicious PDF — malware analysis report

Static analysis result for SHA-256 8607b13388d73442…

MALICIOUS

PDF

91.3 KB Created: 2021-09-15 12:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2535db20a274c5752c169a418783818f SHA-1: 0c1150e628641c9d3783b8dd02ba81aacc364468 SHA-256: 8607b13388d73442dc532108d9ab27bc3de2f1c0294e81f3bbdedf03c67ebcb1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=god+of+war+4+steam PDF link annotation
    • https://b2cexpressdemo.com/userfiles/file/gamiwegas.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/94159499382.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/novotalesijulazo.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/fosazivaxinebusunopuder.pdfIn PDF document text
    • http://kasargod.net/uploads/file/99607099683.pdfIn PDF document text
    • http://pactolous.hu/upload/file/pitulogu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p953klprjkvvltdaf43nu9hut1/watovifozufewanogoxeb.pdfIn PDF document text
    • https://breedlife.com/upload/files/rudajiguze.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161394d104c6df---lowaki.pdfIn PDF document text
    • https://ijp2.com/contents/files/40946866308.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/71826901767.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/nurezurizo.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/fajilerovewofaditebu.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/97340061419.pdfIn PDF document text
    • http://ledins.lv/cms/file/zexoxevo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ctk6llhvionf7e63cms1rrjmek/nozolipisomafulela.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/56973488173.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/xezipiruju.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f7c18a5151ef0288960f3cae42450855/vofuwavaxonu.pdfIn PDF document text
    • http://inistor.com/ufiles/files/43224422209.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/57322646820.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 10476 bytes
SHA-256: 7a97814629ef15d4cc147740f8bce2de46c6a49658e2950e123efadfff0b49cd
font_01_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 17652 bytes
SHA-256: 50fc03b2f59782a0bfdfb6151d9a25dabdd3613f44e91cab49726b9c593bbc88
font_02_sfnt_off000147d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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